and developed the new ISR - Interrupt Service Routine
handler - much easier than the old waitForInterrupt code!
Minor tweaks to the gpio program to recognise the environment variable
WIRINGPI_DEBUG too, and removed the printing of the errors from the
main wiringPi setup routines (and added some new ones!)
delayMicrosecondsHard re-written - again.
Added a serialRead example program, and added in the okLed
to the examples too.
Updated/checked some of the GPIO/PWM code.
Added in some experimental servo and tone generating code and
and example or 2.
Tweaks to the gpio command to correctly load the I2C modules too.
Also Makefile tweaks to help improve things somewhat - decided to
read the Makefile manual after some 15 years to updated my make
grey cells somewhat.
New command in the gpio command - readall
accomodate the changes in pin that are present on the Revision
2 Raspberry Pi board.
Added in simple debugging too - set the environment variable
WIRINGPI_DEBUG
to get some more debug messages out
